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STAT-Es PATENT OFFICE.

I HARRY 8. mean, or BBOOKLINE, mnssncnusn'rrs, ASSIGNOR, BY MEs'uEASSIGNMENTS,

I "1'0 AMERICAN LA. FRANCE FIRE ENGINE COMPANY INC., OF ELMIRA, NEWYORK, A.

COBEORATION OF NEW YORK.

1,soc,7os. f No Drawing.

' To all whom it may concern:

- Be it known that I, HARRY S; Moan, a

citizen of the, United States, residing at ;Brokline, county of Norfolk,State of ,5V Massachusetts, have invented acertain new iandusefulFire-Extinguisher Composition,

zofcwhich'the following is a sfiecification;

' ""Myinvention relates to e extinguisher charges and more particularlyto the carbonate solution from which carbon dioxid for expelling theextinguishing medium is gen- L b reaction with a suitable acid;

(Alkali metal salts fof carbonic acid, either iii-the form ofbicarbonate or in theform of the normal carbonate have been comnonlemployed for such solutions, while v. Sulfuric acid or-hydrochloric acidhas usuallv been employed, as the acid charge. In

;ord er that the carbonate solution. may al-' 20. even when exposed'to'low temperatures, it

vhas been roposed to'incorporate in the car-' ways/remain in a conditionsuitable for; use

,ibonatelso ution, an ingredient for. lowering th e'free'zing pointthereof. Most of those inlpo'sedj-f o r this purpose are subject to onev disadvantage or another. In some instances, the addition agent tendsto 've rise to the formationfof a precipitate o insoluble car-Q bonateor othersalt'oiv-to retard the genera tion orevolutionof thefcarbondioxld gas; "or. its efiect' injsmall quantities has not been isufliciently lmarlgedf in depressing the freezfigip i I .1 a i Theobject of my' nvention is to produce fjgilcarbonate solution-charge ofthe desired 516w freezingpoin't which shall be free from thedisadvantages above noted. At'the same 1 his, the invention seeks toavoid the use of Ingredients whichmight involve undue exor which wouldin any way interfere wlth the fire extinguishing qualities of the mediumwhich is to be elected from the apparatus.

'vention, exhibit all the required qualities as a charge for fireextinguishers and in addition to having the h ghlyadvantageous lowfreezing point, the capacity of the solution for giving off carbondioxid gas when treated with acid, is greatly im roved by .the presenceof the ingredients or lower- H "minute, and no further increase up tothe endbfthefifth minute.

ing'the freezing point;

To clearly illustrate the princlples of the gredients which have beenheretofore pro- The solutions embraced by my present in nvention and toenable those skilled in the sium carbonate and glycerin in water, I mayrefer, for example, to the following proportions: a V 1 v 4.54 grams ofpotassium carbonate and 162 grams of glycerin. when dissolvedinSpecification of Letters Patent. Patented June 1'7, 1919. 1 Applicationfiled anuar 14, 1918. Serial No.21'1,8 37.

100cubic centimeters of water,--constitute a solution having a freezingpoint below 54 F. This solution at ordinaryftemperatures is quite fluidand 'inve'very way suitable for employment in a fire extinguisher. Asthe 'presenceof the glycerin as will be apparent from a comparison of 'asample made up of the simple solution of potassium carbonate n water andone in which the glycerin is mco rated. Taking a test quantity of 15 cuic centimeters at 20? 'C; from a solu-. 'tion made up of 4.54 grams ofpotassium carbonate in 100 cubic centimeters-of water, and treating thiswith '1 c. c. of sulfuric acid of suflicient strength to neutralizetwo-' thirds of the carbonate. present, the total gas evolution showedabout 32%; cubicvcentime ters at the end of the first minute, 33%;

cubic-centimeters at the end of the second 7 ,minute, 34% cubiccentimeters at the end of the third minute, 35 cubic centimeters at turefrom asolution made u of 4.54 grams of potassium carbonate an 162, gramsof glycerin in 100 cubic centimeters of water-,-

when treated with the same proportions of sulfuric acid showed a totalgas-evolution of about 39% cubic centiment'ers at the-end of thefirstminute, 4% cubiccentimeters at the end of the second minute,Be-cubic centi- -meters at the end of the third minute, 44%

cubic centimeters at the'end of the fourth In the case of soclinmbicerbcnate enilij glycerin made up in 'a, watelysoliitibncthe";

proportions may be re resented',a,'s:ffcrj,eX ample 5.53 amsjoftemperatures is about 4:8 0 J F.

tion of sodium bicarbcnate in water.

- Other ,alkali metal cerbonateimaybe" gemf.

ployed with :glyceiin, fi der-the .hi cizd prin- 'ciples of theinvention. ;.I may-umcntionhs furtherexamphs potassiumbicarbonate andgyycerin in-the proportion of 6L6Qgr'ams of the bicarbonate. to 149.8grams bf glycerin I I in 100 c. c.- of water 0i, 5.21grams of sodium 20blcarbonete with 1502 grams ofglycerinin' cQof iw aferi ofthesesolutions has asfnaezing, 'xiint' somewhat lower than m: that aboye;descr'ibeii indicated 1 a, greater capacity. foii'setting'iree carbondioxid than when-the glycerin wasnqt' present;

"P I, 'l-will. hils-b seen that my invcnticn" :-p 1 vides,;n0t only fora, very low freezing point ofi'sjolution. but at the same t1me,con'-side'rably'im roves the, capacity of-the solution for deve oping carbondioxid gas when A. can eennlay, fire extinguish ers,- comprising "as esntial ingredients, am, momumhlcarbcnate and glycenn, substan th theepidin a fire extinguisher.

ti'ally'in th'epro" rtions of 5.21 grams of Y I .ammoniumlbic'ar hateand 150.2 grams ,of

glycerin inlOO cubic centimeters of water." :Zfif HARRY-S. MORK.

